mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 15:37:23 +00:00
8163faf952
Allow placing a Linux kernel image header at the start of the U-Boot binary. This is useful since the image header reports the amount of memory (BSS and similar) that U-Boot needs to use, but that isn't part of the binary size. This can be used by the code that loads U-Boot into memory to determine where to load U-Boot, based on other users of memory. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
364 lines
7.8 KiB
ArmAsm
364 lines
7.8 KiB
ArmAsm
/*
|
|
* (C) Copyright 2013
|
|
* David Feng <fenghua@phytium.com.cn>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <asm-offsets.h>
|
|
#include <config.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/macro.h>
|
|
#include <asm/armv8/mmu.h>
|
|
|
|
/*************************************************************************
|
|
*
|
|
* Startup Code (reset vector)
|
|
*
|
|
*************************************************************************/
|
|
|
|
.globl _start
|
|
_start:
|
|
#if defined(LINUX_KERNEL_IMAGE_HEADER)
|
|
#include <asm/boot0-linux-kernel-header.h>
|
|
#elif defined(CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK)
|
|
/*
|
|
* Various SoCs need something special and SoC-specific up front in
|
|
* order to boot, allow them to set that in their boot0.h file and then
|
|
* use it here.
|
|
*/
|
|
#include <asm/arch/boot0.h>
|
|
#else
|
|
b reset
|
|
#endif
|
|
|
|
.align 3
|
|
|
|
.globl _TEXT_BASE
|
|
_TEXT_BASE:
|
|
.quad CONFIG_SYS_TEXT_BASE
|
|
|
|
/*
|
|
* These are defined in the linker script.
|
|
*/
|
|
.globl _end_ofs
|
|
_end_ofs:
|
|
.quad _end - _start
|
|
|
|
.globl _bss_start_ofs
|
|
_bss_start_ofs:
|
|
.quad __bss_start - _start
|
|
|
|
.globl _bss_end_ofs
|
|
_bss_end_ofs:
|
|
.quad __bss_end - _start
|
|
|
|
reset:
|
|
/* Allow the board to save important registers */
|
|
b save_boot_params
|
|
.globl save_boot_params_ret
|
|
save_boot_params_ret:
|
|
|
|
#if CONFIG_POSITION_INDEPENDENT
|
|
/*
|
|
* Fix .rela.dyn relocations. This allows U-Boot to be loaded to and
|
|
* executed at a different address than it was linked at.
|
|
*/
|
|
pie_fixup:
|
|
adr x0, _start /* x0 <- Runtime value of _start */
|
|
ldr x1, _TEXT_BASE /* x1 <- Linked value of _start */
|
|
sub x9, x0, x1 /* x9 <- Run-vs-link offset */
|
|
adr x2, __rel_dyn_start /* x2 <- Runtime &__rel_dyn_start */
|
|
adr x3, __rel_dyn_end /* x3 <- Runtime &__rel_dyn_end */
|
|
pie_fix_loop:
|
|
ldp x0, x1, [x2], #16 /* (x0, x1) <- (Link location, fixup) */
|
|
ldr x4, [x2], #8 /* x4 <- addend */
|
|
cmp w1, #1027 /* relative fixup? */
|
|
bne pie_skip_reloc
|
|
/* relative fix: store addend plus offset at dest location */
|
|
add x0, x0, x9
|
|
add x4, x4, x9
|
|
str x4, [x0]
|
|
pie_skip_reloc:
|
|
cmp x2, x3
|
|
b.lo pie_fix_loop
|
|
pie_fixup_done:
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYS_RESET_SCTRL
|
|
bl reset_sctrl
|
|
#endif
|
|
/*
|
|
* Could be EL3/EL2/EL1, Initial State:
|
|
* Little Endian, MMU Disabled, i/dCache Disabled
|
|
*/
|
|
adr x0, vectors
|
|
switch_el x1, 3f, 2f, 1f
|
|
3: msr vbar_el3, x0
|
|
mrs x0, scr_el3
|
|
orr x0, x0, #0xf /* SCR_EL3.NS|IRQ|FIQ|EA */
|
|
msr scr_el3, x0
|
|
msr cptr_el3, xzr /* Enable FP/SIMD */
|
|
#ifdef COUNTER_FREQUENCY
|
|
ldr x0, =COUNTER_FREQUENCY
|
|
msr cntfrq_el0, x0 /* Initialize CNTFRQ */
|
|
#endif
|
|
b 0f
|
|
2: msr vbar_el2, x0
|
|
mov x0, #0x33ff
|
|
msr cptr_el2, x0 /* Enable FP/SIMD */
|
|
b 0f
|
|
1: msr vbar_el1, x0
|
|
mov x0, #3 << 20
|
|
msr cpacr_el1, x0 /* Enable FP/SIMD */
|
|
0:
|
|
|
|
/*
|
|
* Enable SMPEN bit for coherency.
|
|
* This register is not architectural but at the moment
|
|
* this bit should be set for A53/A57/A72.
|
|
*/
|
|
#ifdef CONFIG_ARMV8_SET_SMPEN
|
|
switch_el x1, 3f, 1f, 1f
|
|
3:
|
|
mrs x0, S3_1_c15_c2_1 /* cpuectlr_el1 */
|
|
orr x0, x0, #0x40
|
|
msr S3_1_c15_c2_1, x0
|
|
1:
|
|
#endif
|
|
|
|
/* Apply ARM core specific erratas */
|
|
bl apply_core_errata
|
|
|
|
/*
|
|
* Cache/BPB/TLB Invalidate
|
|
* i-cache is invalidated before enabled in icache_enable()
|
|
* tlb is invalidated before mmu is enabled in dcache_enable()
|
|
* d-cache is invalidated before enabled in dcache_enable()
|
|
*/
|
|
|
|
/* Processor specific initialization */
|
|
bl lowlevel_init
|
|
|
|
#if defined(CONFIG_ARMV8_SPIN_TABLE) && !defined(CONFIG_SPL_BUILD)
|
|
branch_if_master x0, x1, master_cpu
|
|
b spin_table_secondary_jump
|
|
/* never return */
|
|
#elif defined(CONFIG_ARMV8_MULTIENTRY)
|
|
branch_if_master x0, x1, master_cpu
|
|
|
|
/*
|
|
* Slave CPUs
|
|
*/
|
|
slave_cpu:
|
|
wfe
|
|
ldr x1, =CPU_RELEASE_ADDR
|
|
ldr x0, [x1]
|
|
cbz x0, slave_cpu
|
|
br x0 /* branch to the given address */
|
|
#endif /* CONFIG_ARMV8_MULTIENTRY */
|
|
master_cpu:
|
|
bl _main
|
|
|
|
#ifdef CONFIG_SYS_RESET_SCTRL
|
|
reset_sctrl:
|
|
switch_el x1, 3f, 2f, 1f
|
|
3:
|
|
mrs x0, sctlr_el3
|
|
b 0f
|
|
2:
|
|
mrs x0, sctlr_el2
|
|
b 0f
|
|
1:
|
|
mrs x0, sctlr_el1
|
|
|
|
0:
|
|
ldr x1, =0xfdfffffa
|
|
and x0, x0, x1
|
|
|
|
switch_el x1, 6f, 5f, 4f
|
|
6:
|
|
msr sctlr_el3, x0
|
|
b 7f
|
|
5:
|
|
msr sctlr_el2, x0
|
|
b 7f
|
|
4:
|
|
msr sctlr_el1, x0
|
|
|
|
7:
|
|
dsb sy
|
|
isb
|
|
b __asm_invalidate_tlb_all
|
|
ret
|
|
#endif
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
WEAK(apply_core_errata)
|
|
|
|
mov x29, lr /* Save LR */
|
|
/* For now, we support Cortex-A53, Cortex-A57 specific errata */
|
|
|
|
/* Check if we are running on a Cortex-A53 core */
|
|
branch_if_a53_core x0, apply_a53_core_errata
|
|
|
|
/* Check if we are running on a Cortex-A57 core */
|
|
branch_if_a57_core x0, apply_a57_core_errata
|
|
0:
|
|
mov lr, x29 /* Restore LR */
|
|
ret
|
|
|
|
apply_a53_core_errata:
|
|
|
|
#ifdef CONFIG_ARM_ERRATA_855873
|
|
mrs x0, midr_el1
|
|
tst x0, #(0xf << 20)
|
|
b.ne 0b
|
|
|
|
mrs x0, midr_el1
|
|
and x0, x0, #0xf
|
|
cmp x0, #3
|
|
b.lt 0b
|
|
|
|
mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
|
|
/* Enable data cache clean as data cache clean/invalidate */
|
|
orr x0, x0, #1 << 44
|
|
msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
|
|
#endif
|
|
b 0b
|
|
|
|
apply_a57_core_errata:
|
|
|
|
#ifdef CONFIG_ARM_ERRATA_828024
|
|
mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
|
|
/* Disable non-allocate hint of w-b-n-a memory type */
|
|
orr x0, x0, #1 << 49
|
|
/* Disable write streaming no L1-allocate threshold */
|
|
orr x0, x0, #3 << 25
|
|
/* Disable write streaming no-allocate threshold */
|
|
orr x0, x0, #3 << 27
|
|
msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARM_ERRATA_826974
|
|
mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
|
|
/* Disable speculative load execution ahead of a DMB */
|
|
orr x0, x0, #1 << 59
|
|
msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARM_ERRATA_833471
|
|
mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
|
|
/* FPSCR write flush.
|
|
* Note that in some cases where a flush is unnecessary this
|
|
could impact performance. */
|
|
orr x0, x0, #1 << 38
|
|
msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARM_ERRATA_829520
|
|
mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
|
|
/* Disable Indirect Predictor bit will prevent this erratum
|
|
from occurring
|
|
* Note that in some cases where a flush is unnecessary this
|
|
could impact performance. */
|
|
orr x0, x0, #1 << 4
|
|
msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARM_ERRATA_833069
|
|
mrs x0, S3_1_c15_c2_0 /* cpuactlr_el1 */
|
|
/* Disable Enable Invalidates of BTB bit */
|
|
and x0, x0, #0xE
|
|
msr S3_1_c15_c2_0, x0 /* cpuactlr_el1 */
|
|
#endif
|
|
b 0b
|
|
ENDPROC(apply_core_errata)
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
WEAK(lowlevel_init)
|
|
mov x29, lr /* Save LR */
|
|
|
|
#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
|
|
branch_if_slave x0, 1f
|
|
ldr x0, =GICD_BASE
|
|
bl gic_init_secure
|
|
1:
|
|
#if defined(CONFIG_GICV3)
|
|
ldr x0, =GICR_BASE
|
|
bl gic_init_secure_percpu
|
|
#elif defined(CONFIG_GICV2)
|
|
ldr x0, =GICD_BASE
|
|
ldr x1, =GICC_BASE
|
|
bl gic_init_secure_percpu
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARMV8_MULTIENTRY
|
|
branch_if_master x0, x1, 2f
|
|
|
|
/*
|
|
* Slave should wait for master clearing spin table.
|
|
* This sync prevent salves observing incorrect
|
|
* value of spin table and jumping to wrong place.
|
|
*/
|
|
#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
|
|
#ifdef CONFIG_GICV2
|
|
ldr x0, =GICC_BASE
|
|
#endif
|
|
bl gic_wait_for_interrupt
|
|
#endif
|
|
|
|
/*
|
|
* All slaves will enter EL2 and optionally EL1.
|
|
*/
|
|
adr x4, lowlevel_in_el2
|
|
ldr x5, =ES_TO_AARCH64
|
|
bl armv8_switch_to_el2
|
|
|
|
lowlevel_in_el2:
|
|
#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
|
|
adr x4, lowlevel_in_el1
|
|
ldr x5, =ES_TO_AARCH64
|
|
bl armv8_switch_to_el1
|
|
|
|
lowlevel_in_el1:
|
|
#endif
|
|
|
|
#endif /* CONFIG_ARMV8_MULTIENTRY */
|
|
|
|
2:
|
|
mov lr, x29 /* Restore LR */
|
|
ret
|
|
ENDPROC(lowlevel_init)
|
|
|
|
WEAK(smp_kick_all_cpus)
|
|
/* Kick secondary cpus up by SGI 0 interrupt */
|
|
#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
|
|
ldr x0, =GICD_BASE
|
|
b gic_kick_secondary_cpus
|
|
#endif
|
|
ret
|
|
ENDPROC(smp_kick_all_cpus)
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
ENTRY(c_runtime_cpu_setup)
|
|
/* Relocate vBAR */
|
|
adr x0, vectors
|
|
switch_el x1, 3f, 2f, 1f
|
|
3: msr vbar_el3, x0
|
|
b 0f
|
|
2: msr vbar_el2, x0
|
|
b 0f
|
|
1: msr vbar_el1, x0
|
|
0:
|
|
|
|
ret
|
|
ENDPROC(c_runtime_cpu_setup)
|
|
|
|
WEAK(save_boot_params)
|
|
b save_boot_params_ret /* back to my caller */
|
|
ENDPROC(save_boot_params)
|